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12.7 Detroit s60 non egr slight haze of smoke on idle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Guf, Jun 22, 2019.

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  1. Jun 22, 2019 #1
    Guf

    Guf Light Load Member

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    Truck smokes a slight haze on idle, more visible at night by a light pole. Is this a concern or a usual thing. I've seen some trucks smoke at truck stops at night while idling.

    Its turned up by diesel doctor. Injectors set at 75, 7 percent fuel added. Before the manifold turbo and retune it didnt smoke haze on idle. During the day it's very hard to notice, also very strong diesel smell from the exhaust. I actually climbed up top and put my hand over the exhaust and smelled it. Was very strong diesel unburnt smell. I'm wondering if there is to much fuel on idle and can be tuned better? Or faulty injector? Low idle or high idle it smokes but very light haze ,1.6 million milestone the engine over hauled at 1mil. Also noticed a slight vibration while accelerating between 1250 to 1500rpm. 2 injectors where replaced by previous owner like 200k. Truck runs hard and pulls like a champ!
     
    Guf, Jun 22, 2019
    Guf, Jun 22, 2019
    #1
    DetroitDudeBro and Rideandrepair Thank this.
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  3. Jun 22, 2019 #2
    Rideandrepair

    Rideandrepair Road Train Member

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    Mine does that, under a street light, sometimes , It is sometimes only visible from one one view, walk around and can’t be seen, it depends on the lighting, very strange, and alarming, Lol. I can’t figure it out. Maybe has something to do with humidity, as I notice it only at night. Maybe it’s the dew in the air? It’s strange though,
     
    Rideandrepair, Jun 22, 2019
    Rideandrepair, Jun 22, 2019
    #2
    Guf Thanks this.
  4. Jun 22, 2019 #3
    Wanabe1

    Wanabe1 Light Load Member

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    Wanabe1, Jun 22, 2019
    Wanabe1, Jun 22, 2019
    #3
  5. Jun 22, 2019 #4
    swaan

    swaan Road Train Member

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    It's the 75 trim codes in your ecm. Some cylinders are getting to much fuel at idle. They should all be set what the injector calls for, your engine will run smoother and no stink and haze at idle.

    You want more power do it the right way and put bigger injectors in your engine with the correct codes as per injector.
     
    swaan, Jun 22, 2019
    swaan, Jun 22, 2019
    #4
    Guf, QUALITYTRUCK, BoxCarKidd and 1 other person Thank this.
  7. Jun 22, 2019 #5
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Try setting trim codes to 55 for all if you don't want to remove rocker cover and get correct codes for each injector.
     
    QUALITYTRUCK, Jun 22, 2019
    QUALITYTRUCK, Jun 22, 2019
    #5
    Captain Mudsocks and Guf Thank this.
  8. Jun 23, 2019 #6
    Guf

    Guf Light Load Member

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    What injectors would you recommend? Also is it an issue the way it is?
     
    Guf, Jun 23, 2019
    Guf, Jun 23, 2019
    #6
  9. Jun 23, 2019 #7
    Guf

    Guf Light Load Member

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    That wont kill power? Diesel doc set the trim codes, told me that's they set them at for Detroits.
     
    Guf, Jun 23, 2019
    Guf, Jun 23, 2019
    #7
  10. Jun 23, 2019 #8
    Guf

    Guf Light Load Member

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    I'm kinda sketch about the tune. Can anyone recommend or send info of a detriot gerund. I know rebel127 is the guy, but cant find any contact to him
     
    Guf, Jun 23, 2019
    Guf, Jun 23, 2019
    #8
  11. Jun 23, 2019 #9
    swaan

    swaan Road Train Member

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    It all depends what engine you have. Also what tune your running. No your not going to hurt it running the 75 codes , it will just do what your describing.

    I sent you Leon's contact info. He can set you up with proper tune and possible injector recomendation if so needed.
     
    swaan, Jun 23, 2019
    swaan, Jun 23, 2019
    #9
    DetroitDudeBro and Guf Thank this.
  12. Jun 23, 2019 #10
    Guf

    Guf Light Load Member

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    It's a 99 12.7 Detroit 470/500 hp ddec 4 I think
     
    Guf, Jun 23, 2019
    Guf, Jun 23, 2019
    #10
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